You can do thing like this in your configuration.nix:
```
let pkgs-16_03 = import (fetchTarball
http://nixos.org/releases/nixos/16.03-beta-small/nixos-16.03.252.dc3073b/nixexprs.tar.xz)
{}; in {
environment.systemPackages = [ pkgs-16_03.w3m ];
}
```
That basically brings in the nixpkgs expression at `dc3073b` content
address, and then installs `w3m` from that package set.
In this case, we are content addressing `w3m` by proxy of content
addressing nixpkgs. The nixpkgs in that content address would contain
the `w3m` content address.
Beware that if you do it this way, the package may not be available in
the binary cache, and it may result in a from source build.
At the same time, we still don't have a content-addressable upstream
package sources, so I'm looking into fixing that with IPFS.
On 13/08/2016 6:06 AM, Nick Sabalausky wrote:
On 08/12/2016 02:58 AM, Roger Qiu wrote:
Nix is based on content addressing. To install a specific version of a
package, just pick a version, fix the content address, and install it!
[...]
or if a previous (or newer) revision of nixpkgs had the
package, then you load that package set and point to a package there to
install it.
Can you point me to documentation for that? I only know of installing
via "environment.systemPackages", enabling a service, or "nix-env -i
...".
I did just now try following this:
https://nixos.org/nixpkgs/manual/#sec-modify-via-packageOverrides
And created a ~/.nixpkgs/config.nix containing (just to try things
out) this:
{
packageOverrides = pkgs: rec {
firefox = pkgs.firefox.override {
common.version = "33.0";
};
};
}
But then I just get:
$ nix-env -i firefox
error: attribute ‘override’ missing, at
/home/nick/.nixpkgs/config.nix:3:13
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